I'm the guy in the green shirt. I've been playing hockey my whole life, and it truly has helped me with explosive power and raw athleticism. Body positioning is one thing that will take time to get used to because obviously someone who has grappled before will have the upper hand on you. Yet my base seems to be pretty good and that has to have been from taking repeated hits on the ice and keeping my balance. But the ability to think quickly and ahead of the opponent is something that a hockey player is all too familiar with. Once you've got some body awareness, it'll all start to click. Basically the overall will to compete will always be there, and the explosive power and raw athleticism will shine through. My only downfall is tight hips from skating and Having to consistently work my flexibility harder than most to even attempt rubber guard. But I recommend 10th Planet Jiu Jitsu, Because to me the movements in hockey are very finite and limited, whereas in jiu jitsu there is no limit to what you can do and what you cant. Just give it a try you really have nothing to lose.